Custom CSS - Custom journal design

[DanielRonnstam]

Hi. I want to completely change the journal's look so that it doesn't show any black frame at all but only a webp image as background, with all content over that background image (for the players). No frame but an X up in right corner.

I tried to install Custom CSS module but with Ernies UI this doesn't work to change the journal background. How do I do? I used this code snippet..

.sheet.journal-entry .journal-entry-content {
background: url("journal-backgrounds/journal_back_706.webp") repeat;
}

[DanielRonnstam]

This is how it looks without Ernies active for Players, but still not 100% as the black frame need to be removed also.